General Description

The function of the fuel and air control system is to manage the fuel and the air delivery to each cylinder, optimizing the performance and the driveability of the engine under all driving conditions. The fuel supply is stored in the fuel tank located behind the rear wheels. The fuel sender allows retrieval of fuel from the tank and also provides information on the fuel level.

An electric fuel pump contained in the modular fuel sender pumps the fuel through the nylon lines and an in-line fuel filter to the fuel rail. The pump is designed to provide the fuel at a pressure above the regulated pressure which is needed by the injectors. The fuel is then distributed through the fuel rail to six injectors inside of the intake manifold. The fuel pressure is controlled by a pressure regulator that is mounted on the fuel rail.

The fuel system in this vehicle is recirculating. This means that any excess fuel that is not injected into the cylinders is sent back to the fuel tank by a separate nylon line. This removes any air and any vapors from the fuel as well as keeping the fuel cool during hot weather operation. Each fuel injector is located directly above each cylinders two intake valves. The throttle body regulates the air flow from the air cleaner into the intake manifold, which then distributes this air to each cylinders two intake valves. This allows the driver to control the air flow into the engine, which then controls the power output of the engine. Unleaded fuel must be used with all of the gasoline engines for a proper emission control system operation. Using unleaded fuel will also minimize any spark plug fouling and extend the engine oil life. Leaded fuel can damage the emission control system, and use of leaded fuel can result in loss of emission warranty coverage.